Bently 3500-32 125712-01 Four‑Channel Relay Module

Description

Hardware & Electrical Specifications

‑ Manufacturer: Bently Nevada (Baker Hughes) ‑ Compatible System: 3500‑05 full‑size / mini TSI machinery‑protection rack ‑ Functional Type: 4‑Channel Programmable Relay Output Module ‑ Channel quantity: 4 isolated SPDT (Form‑C) relay channels ‑ Relay Contact Rating: 5A @250VAC; 5A @30VDC ‑ Typical Response Time: ≤10 ms ‑ Typical Power Consumption: 10 W, powered by rack backplane bus ‑ Front‑panel Indicators: OK LED, four channel status LED for each relay output ‑ Matching Parts: Main board 125712‑01 must pair with rear I/O board 125720‑01, sold separately ‑ Hot‑swap: Supports hot‑swap; during replacement, measurement channels keep running, corresponding relay output is temporarily invalid. ‑ PCB Coating: Conformal coated for G3 harsh industrial cabinet environment

Environmental Specifications

‑ Operating Temperature: 0 °C ~ +60 °C ‑ Storage Temperature: ‑40 °C ~ +85 °C ‑ Relative Humidity: 5%‑95 % non‑condensing ‑ Vibration & Shock: Complies with API‑670 power‑plant cabinet EMC standards

Mechanical Data

‑ Dimension(W×H×D):25.4 mm ×120.7 mm ×251.5 mm ‑ Weight: approx 0.70 kg

Core Functions

1. Configurable alarm‑drive logic: Each relay channel supports AND / OR voting logic; can select Alert, Danger, module fault status from any monitor channel inside rack as trigger sourceBaker Hugh….
2. Relay mode selection: Each channel configurable for latching or non‑latching relay output.
3. External interlock driving: Output dry‑contact signal to drive site alarm indicator, turbine/gas‑turbine protection trip interlock circuit.
4. Multi‑module expansion: Multiple 3500/32 modules can be installed in one rack to expand relay output quantity.
5. Self‑diagnosis: Module monitors internal working status, reports fault event to rack system log.

Installation, Replacement & Critical Warnings

1. Module supports hot‑swap; measurement & protection logic of monitor cards keep running during hot‑swap, relay output will be temporarily disconnected.
2. Compatibility warning: 125712‑01 main board must work with rear I/O board 125720‑01; cannot use without rear terminal board.
3. After replacement, check OK and channel LED status; download rack configuration project, verify each relay action and voting‑logic function.
4. Common failure mode: Relay contact burnout under over‑current load, backplane circuit surge damage. Avoid over‑rating load on relay contacts.

5. For TMR triple‑redundant protection system, trip logic needs multi‑relay voting configuration to realize fault‑tolerant protection.